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Rotación impulsada por luz visible de motores moleculares en ciclos metálicos supramoleculares discretos
Zhao-Tao Shi1, Yi-Xiong Hu2, Zhubin Hu3
1Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering, Feringa Nobel Prize Scientist Joint Research Center, Frontiers Science Center for Materiobiology and Dynamic Chemistry, Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China.
Journal of the American Chemical Society
|December 29, 2020
Resumen
Los investigadores crearon metaciclos sensibles a la luz visible utilizando motores moleculares. Estas estructuras permiten el movimiento colectivo controlado y el autoensamblaje jerárquico para materiales adaptativos avanzados.
Área de la Ciencia:
- Química supramolecular
- Ciencias de los materiales
- Nanotecnología
Sus antecedentes:
- La organización de motores moleculares en ensamblajes supramoleculares es clave para los sistemas sensibles.
- El autoensamblaje impulsado por la coordinación del metal en metaciclos ofrece un control preciso sobre el posicionamiento del motor.
- El desarrollo de sistemas para el movimiento amplificado y transmitido es crucial para las tecnologías futuras.
Objetivo del estudio:
- Diseñar y sintetizar metales sensibles a la luz visible que incorporen motores moleculares.
- Investigar el movimiento cooperativo y las capacidades de autoensamblaje jerárquico de estos metaciclos.
- Explorar el potencial de estos sistemas para crear materiales dinámicos y adaptables.
Principales métodos:
- Síntesis de un ligando motor molecular modificado por piridil (MPY) y su coordinación con los aceptores di-Pt (II).
- Caracterización de la formación, el tamaño y la forma del ciclo metálico utilizando diversas técnicas espectroscópicas y microscópicas.
- Estudios de isomerización fotoquímica y térmica, espectroscopia de dicroísmo circular (CD) y dispersión dinámica de la luz (DLS) para evaluar la función motora y el comportamiento de agregación.
Principales resultados:
- Se ensamblaron con éxito metales discretos de diferentes tamaños y formas, exhibiendo bandas de absorción desplazadas al rojo que responden a la luz visible.
- Se confirmó la rotación impulsada por la luz de los motores moleculares dentro de los metaciclos, preservando las inversiones de helicidad durante la isomerización.
- El autoensamblaje jerárquico de un ciclo metálico trímero con heparina demostró la manipulación selectiva de la agregación secundaria sin interrumpir las estructuras primarias.
Conclusiones:
- Los ciclos metálicos sensibles a la luz visible que contengan múltiples motores rotativos pueden ensamblarse de manera controlada.
- Estos sistemas facilitan el movimiento cooperativo y la creación de estructuras jerárquicas dinámicas.
- Los metaciclos desarrollados son prometedores para aplicaciones en materiales adaptativos y sistemas receptivos.
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